Refrigerating system



Filed May 20, 1933 Refrigerant W'V'fluoro Derivative of Dimebhyl Ketone Compressor Condenser Evaporator Inventor Paul F. Schlin man,

y H E.

His A torney.

Patented May 3, 1934 earner err-ice LQEdR lE? G SYSTEM F. Schlingman,

Schenectady N. 321., assignor to General Eiectric ilompany, a corporation of New York Application May .219, 1933, Serial No. 572,031

4 @laims.

This invention relates to refrigerating systems and is more particularly concerned with the refrigerant employed therein.

The trifiuoro derivative of dimethyl lretone (triiluoro acetone) CFs-CO-CI-Ia possesses properties which make it admirably suitable for use as a refrigerant, especially in systems employing a low pressure type refrigerant. This material boils at about 22 O when subjected to atmospheric pressure is relatively stable, and its specific gravity is about 1.29. It is not miscible with lubricating oils ordinarily used in refrigerating systems and is relatively non-inflammable. It is non-toxic and has a mild, pleasant odor. These properties are highly desirable in a refrigerant.

The trifiuoro derivative of dimethyl ketone may be prepared by either one of two general methods. One of these methods involves the decomposition of trifiuoro-acetoacetic ester by heating with dilute sulphuric acid and the other method consists of the condensation of ethyl trifluoro acetate and ethyl acetate in the presence of sodium in an ethereal solution to form sodium trifiuoracetoacetate which is then decomposed by an excess of dilute sulphuric acid.

The accompanying drawing forming part of this application illustrates diagrammatically a refrigerating system comprising a compressor,

'EOIHdGZESGl and evaporator.

In this system the trifiuoro acetone passes through the cycle of first being compressed by the compressor, then passes to the condenser where it is cooled and condensed into a liquid which passes to the evaporater, the liquid refrigerant vaporized in the evaporator being finally returned to the compressor to complete the cycle.

What I claim as new and desire to secure by Letters Patent of the United States, is:

1. The process of refrigeration which comprises condensing the trhiuoro derivative of dimethyl ketone and then evaporating said derivative.

2. Theprocess of refrigeration which comprises circulating through a refrigerating system including a compressor, a condenser and an evaporator, the trifluoro derivative of dimethyl ketone and successively condensing and evaporating said derivative.

3. The process of transferring heat which comprises condensing trifiuoro acetone and then evaporating it:-

4. The process of transferring heat through a refrigerating system which comprises condensing trifluoro acetone and then evaporating it within the system.

PAUL F. SCHLINGMAN. 

